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Perceptions that occur in the absence of external stimuli: Auditory: Occur most frequently in the psychoses of schizophrenia, mania, and depression. Visual: Occur more frequently in psychotic episodes due to medical, neurologic, and toxin-induced disorders although are often associated with primary psychiatric disease. Olfactory and Gustatory: Often occur as prodromal symptoms of complex partial seizures. Tactile: Frequently occur in delirium i.e., formication is the sensation of bugs crawling on the skin.